Ralph the cat needs your help

This is Ralph and he needs our help. He's lived our backyard for years now as a stray we fed him once and he never left. He is the sweetest  guy, he keeps the peace between the other strays and the raccoons he even has a little girlfriend that watches over him. He is now a part of our family and we would do anything for him. Recently his health has gone down hill. I've tried to do everything I could to treat him in the comfort of our home but the time has come where he needs to go to the vet. He has developed a bunch of medical conditions like mange, severe upper respiratory infection, who knows what else. He cant even open his eyes anymore and anyone that's ever owned a pet knows how expensive it costs even when there aren't crazy problems going on. So I ask to find it in your heart to help out this little guy. All of the critters living in our backyard and us of course would be forever grateful! Anything helps! xo